angular - 背景地理定位 ionic 3 不更新

Question

ionic 的后台地理定位插件未更新。我想要的功能是每 30 秒向插件询问一个 lat lng 值(如果可用)。问题是，它最初只给我值，然后后台停止。前景很好，真的是背景。基本上我无法在后台第一次初始发送后发送请求。

全局定位系统

startTracking() {
  console.log("started tracking");
  const config: BackgroundGeolocationConfig = {
    desiredAccuracy: 10,
    stationaryRadius: 20,
    distanceFilter: 30,
    debug: false, //  enable this hear sounds for background-geolocation life-cycle.
    stopOnTerminate: false
  };

  this.backgroundGeolocation
    .configure(config)
    .subscribe((location: BackgroundGeolocationResponse) => {
      this.zone.run(() => {
        this.lat = location.latitude;
        this.lng = location.longitude;
        this.bearing = location.bearing;
        this.speed = location.speed;
        this.accuracy = location.accuracy;
        this.timestamp = location.time;
      });

      this.backgroundGeolocation.finish(); // FOR IOS ONLY
      this.backgroundGeolocation.stop();
    });

  this.backgroundGeolocation.start();
}

sendGPS() {
  this.optionsService.sendGPS(gpsData).subscribe(result => {});
}

stopTracking() {
  this.sendGPS();
}

应用程序组件.ts

constructor() {
  this.sendGPSStart();
  this.interval();
}

sendGPSStart() {
  this.locationTracker.startTracking();
}

sendGPSStop() {
  this.locationTracker.stopTracking();
}

interval() {
  setInterval(() => {
    this.sendGPSStart();
    this.sendGPSStop();
  }, "30000");
}

Answer 1

查看示例，例如 dnchia/Ionic3-Background-Geolocation你会在后台配置间隔，以及周期性的前台发送

gps.ts

startTracking(interval) {

    console.log('started tracking')
    const config: BackgroundGeolocationConfig = {
      desiredAccuracy: 10,
      stationaryRadius: 20,
      distanceFilter: 30,
      debug: false, //  enable this hear sounds for background-geolocation life-cycle.
      stopOnTerminate: false,
      interval: interval
    };

app.component.ts

interval = 30000;

constructor() {
  this.sendGPSStart()
  this.interval()
}

sendGPSStart(){
  this.locationTracker.startTracking(this.interval);
}

sendGPSStop(){
  this.locationTracker.stopTracking();
}

interval() {
  setInterval(() => {
    this.locationTracker.sendGPS();
  }, this.interval)

}